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arXiv 0704.2015astro-ph
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超新星遗迹与GLAST

Supernova Remnants and GLAST

Patrick Slane

摘要:

长期以来,人们一直推测超新星遗迹是银河系中宇宙射线的主要来源。过去十年的观测隆重地揭示了SNRs中粒子加速到接近宇宙射线谱膝盖的能量的直接证据。壳型SNRs的非热X射线发射揭示了多TeV电子,几个SNRs的动力学性质指向离子的有效加速。对TeV伽马射线发射的观测也证实了在几个遗迹中存在高能粒子,但关于这种发射是来自高能电子还是离子仍然存在相当大的争议。同样不确定的是导致有效粒子加速的确切条件。根据EGRET源的目录,我们知道有大量的银河伽马射线源,其分布与SNRs的分布相似。随着GLAST的分辨率和灵敏度的提高,将从这个群体中识别伽马射线SNR。它们的详细发射结构及其光谱将提供它们的环境与它们在其他波段中的光谱之间的联系,以约束发射模型并可能识别SNR中离子加速的直接证据。在这里,我总结了最近的观测和理论工作在宇宙线加速的信噪比,并讨论GLAST将带来我们对这个问题的理解。

英文摘要:

It has long been speculated that supernova remnants represent a major source of cosmic rays in the Galaxy. Observations over the past decade have ceremoniously unveiled direct evidence of particle acceleration in SNRs to energies approaching the knee of the cosmic ray spectrum. Nonthermal X-ray emission from shell-type SNRs reveals multi-TeV electrons, and the dynamical properties of several SNRs point to efficient acceleration of ions. Observations of TeV gamma-ray emission have confirmed the presence of energetic particles in several remnants as well, but there remains considerable debate as to whether this emission originates with high energy electrons or ions. Equally uncertain are the exact conditions that lead to efficient particle acceleration. Based on the catalog of EGRET sources, we know that there is a large population of Galactic gamma-ray sources whose distribution is similar to that of SNRs. With the increased resolution and sensitivity of GLAST, the gamma-ray SNRs from this population will be identified. Their detailed emission structure, along with their spectra, will provide the link between their environments and their spectra in other wavebands to constrain emission models and to potentially identify direct evidence of ion acceleration in SNRs. Here I summarize recent observational and theoretical work in the area of cosmic ray acceleration by SNRs, and discuss the contributions GLAST will bring to our understanding of this problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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